public class Example5_1 {
    public static void main(String args[]) {
      Student zhang = new Student();
      zhang.age=17;
      zhang.number=100101;
      zhang.showPeopleMess();
      zhang.tellNumber();
      int x=9,y=29;
      System.out.print("会做加法:");
      int result = zhang.add(x,y);
      System.out.printf("%d+%d=%d\n",x,y,result);
      UniverStudent geng = new UniverStudent();
      geng.age=21;
      geng.number=6609;
      geng.showPeopleMess();
      geng.tellNumber();
      System.out.print("会做加法");
      result=geng.add(x,y);
      System.out.printf("%d+%d=%d\n",x,y,result);
      System.out.print("会做乘法");
      result=geng.multi(x,y);
      System.out.printf("%dx%d=%d\n",x,y,result);
    }
}

